Valve-gear for explosive-engines.



No. 868,871. PATENTED OCT. 15, l9'0 7 i-i-l H. TABOR. VALVE GEAR FOR BXPLOSIVB ENGINES.

APPLICATION FILED HAR- B, 1905.

a sumsum 1.

No- 868,371. PATBNTEDQGT. 15, 1907.

H. TABOR. VALVE GEAR FOR EXPLOSIVE ENGINES.

APPLIOATION FILED M AR. 8 1905.

2 SHEETS-SHEET 2.

mm x

UNITED STATES PATENT OFFICE.

HARRIS TAHOE, OF-ELIZABETH, NEW JERSEY.

- VALVE-GEAR son nxPLosIvnnNoINn-s.

Specification of Letters Patent.

' Application filed March 6. 1905. Serial No. 248,371.

' Patented Oct.15, 1907.

Ill tively small and to run them at high speed so as to obtainas iiiiich power aspossible in proportion to weight. Und er such circumstances it is obvious that the movement 'oi'ladmission and exhaust/valves is necessarily exceedingly rapid so' that their inertia becomes amat I some importari'c'e in that it retards their closing movement so'that they do not close at the appropriate point oi thestroke, thus in the case of the admission valve causing the expulsion past the valve of a part of the charge and in the case of the exhaust valve of the '20 return past the valve of a part '01 the exhaust, and in each case the efliciency oi the engine is diminished. Objects of the present invention are to obviate these defects and disadvantages and to close the valyes at appropriate points of the stroke even when the engine is running at very high speed and the movements of the valves are exceedingly rapid,a1id to provide for overcoming the inertia of the opening valves for starting them to move quickly toward their closed positions.

To these and other ends hereinafter set forth, the in- 39 vention comprises the improvements to'be presently described and finally claimed v v e The nature, characteristic features and scope of my invention will be more iully understood from the folj lowing description taken in connection with the accompanying drawings forming part hereof and in which Figure 1, is a View, principally in section, illustrating mechanism embodying features of the invention. Fig. I '2, is a side elevation drawn to an enlarged scale and illustrating partly in section a portion of the apparatus 40 showii in Big. 1, and 3, is a view illustrating mechanism embodying a modification of the invention.

' In the drawings 1, are the valves and they are of puppet type, .As shown in Figs. land 2, they are of the mechanically operated type, that is to say, they are opened by a .cam or the likeas will be described. As 7 shown in Fig. 3, they are shown asoi the automatically operated type, that is to say, they are opened by the incoming mixture.

A description will now be given of means for insuring closure of the valves at the appropriate point of the engine stroke. As shown in Fi 1 and 2, these means comprise cams 2, whose function it is to overcome the inertia of the opening valves and start them to los In Fig. 3, these means comprise acaui 4, together with its accessories which will be described,

Referring to Figs. 1 and 2, the cams 5, are carried by shafts which are driven through the instrumcntality of suitable gearing 6, from an appropriate part of the en gine or a device connected therewith, and they colipen ate with yokes 7, attached to the valve spindles. These cams 5, serve to elevate the valves so that the latter are mechanically opened. The cams 2, are also connected with these shafts and they cooperate with theparts 8, of the yokes and these serve to overcome the inertia of the valves and effect their closure at the appropriate points'in the stroke. Springs 9, when present, serve to enable the parts tooperate in any position and also tend to close the valves and keep them upon their seats As shown in Fig. 3, the valve is raised overcoming the spring 12, but at the limit of its motion, the cam 4, carried by a shaft appropriateiy driven from the engine, operates upon"the part 1.3,"0f the yoke 14, and thus causes the fork 15,, carried by the yoke to collide with the head 16-, of the spindle and -thusquickly start the valve towards closing position. 17, isa spring resting upon a hired support and which may be employed for normally holding the fork 15, in elevated position so as not to interfere with the free opening of the valve and so as to be ready to start it toward closing position at the appropriate partof the stroke.

From the foregoing description it is apparent that however the-valve may be opened, whether autornatically or mechanically, and whatever provision maybe made -for closing it, means are provided for quickly arresting its opening motion and starting its closing motion whereby it is closed at the appropriate part of the stroke. Themechanism which intermittently acts upon the valve when in open position does not force or hold the v'alveiin. closed position to its'seat and this is obviously advantageous and as shown is accomplished by properly proportioning the throw of the return cam so as to make it less than the travel of the valve, or by making the difference in length between the returning spring and the spring which is always in op -ration when under their greatest compression subste htlil-lly equal to the travel of the valve.

It will be obvious to those skilled in the art to which 'my invention appertains that modifications inay be made in detail without departing from the spirit thereof, hence the invention is not limited other than the prior stated! the art may require, but

Letters Pntent'is:

1. The combination of the valve of an internal oxpiu iun engine, and return cam mechanism which intr-rlnitlvmly vnets upon 'the valveonly at the lwginning of its return stroke and from which the valve is free during the romainder of the stroke, substantially as (lvscrihr-(i.

2. The combination with the vulva of an intovnal explosion engine of :1 spring against which the valve always uperates, and return mechanism including :1 can. movunn-nt which intermittently acts upon the valve when in open position to shirt its closing movement and from which the starting it in close. and dvviuvs for st vug'inv. a spring against which tin valve :rlw and mechanism including n'r-nm ninwnivni \vh valve is frnrr during 1hr rvnmindvr of its srrvli fiil wlillltinlly as (inscl'ilwd. I

21. Till 'emnhinulion of the valve of an inll-rnni vxplmlnn .l iil -;a fur :ting il.=- u niu; 12:) motion of tlw Vilhx. suhatnntinlly :15 (ll-st i k'l].

In testimony whereof I have hon-unto sumi 

